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Ok, I checked the .log file and searched for the picture but there where no problems - no error messages or things like that?
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BalboaSPAug 18 '12 at 8:56

I tried with smaller scale values but it also does not work. The caption is also not appearing - it is just not there?! thanks to you helping me
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BalboaSPAug 18 '12 at 9:02

yeah, but this was the error message, when I compiled it wrong with TexStudio! When I do it correct I do not get an error message and the pdf is built without a problem but the picture does not appear!
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BalboaSPAug 18 '12 at 9:09

Please, paste the log you get when you compile it "correct". Also, please, in order to keep clean the question, delete all these temporary comments. I will do the same with mine.
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JLDiazAug 18 '12 at 9:14

1 Answer
1

Graphic does not appear

It may be usefull for all readers of this broad headline of the question to collect all frequent causes for invisible graphics. So please go ahead and add your experience.

Graphic could be off the page; possible check: make the graphic much smaller and have a second look (\includegraphics[scaled=0.1]{picture}), put the graphic into the middle of the paper (\vfill\includegraphics{picture}\vfill), and make the paper larger (e.g. paper a2).

graphicx package is in draft or demo modes. Or the main \documentclass uses draft option (this is passed to all \usepackages)

The graphic file cannot be found, but the error is not seen because the user is using some kind of script which uses batchmode. Possible check: look for errors in the .log file.

You forgot the most important source: The problem can be due to something unrelated to the graphic. So the first step is to comment the \includegraphics and check if the document compiles.
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Ulrike FischerAug 18 '12 at 10:09